US2909619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved hearing-aid
Assignee: Individual
•
Filing: 1954-09-20
•
Granted: 1959-10-20
•
Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 Hollingsworth Eleanor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:49
CPC Classifications
A; A44; A44C; A44C7/00; H; H04; H04R; H04R25/00; H04R25/45; H04R25/456; H04R25/60; H04R25/604; H04R2225/00; H04R2225/59; H04R2225/61; H04R25/603; H04R25/65; H04R25/652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2230500A
Cited
US2327321A
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US2477046A
Cited
US2497336A
Cited
US2506116A
Cited
US2595672A
Cited
US2613282A
Cited
US2549629A
Cited
US2787670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |